The Theosophical Society was set up in 1875
by Madame Helena Petrova Blavatsky, a Russian spiritualist. In her book, The
Secret Doctrine: The Synthesis of Science, Religion and Philosophy,
she purported to have found the Secret Masters who rule the World, and went
on to reveal their teachings (no mention of who was the second gunman on the
grassy knoll, though).
From Morgan's translation of the Huai Nan
Zi as quoted in Needham, Joseph, Science
and Civilisation in China (Volume 2), Cambridge University Press,
Cambridge, 1956, p.68.